Centerless grinder work support



Oct. 26, 1943. e. w.. RAUSCHENBERGER 2,332,528

CENTERLESS GRINDER WORK SUPPORT Filed Dec. 23, 1941 2 Sheets-Sheet l Oct. 26, 1943. w 5 R ER 2,332,528

CENTERLESS GRINDER wbRK SUPPORT Filed Dec. 23, 1941 2 Sheets-Sheet 2 I GEORGE lflfu/smz/vafzase "through'the grinding throat.

Patented Oct. 26, 1943 r CENTERLESYS- enmnnnyvqlt iusurronr George W. Rauschenberger, Ecorse, Mioht, ,assignonto-National Steel Corporation, ajcorpora-l;

tion of Delaware.

' Application December 2s 1941, seis1No; 4,;4, 1ss

' a claims; otterts) Thisinvention relates to improvements in cen- -terless grinders and especially to the positioning andsupport of work pieces therein.

a v In the-conventional centerless grinder agrindi ng' wheel and a regulating Wheel oppose maianother to form a grindinggthroat therebetween. 'Thework piece to be grolindispositioned in this throat on a work rest which is usually in the form I of a. blade making line" contact with, the Work piece. If the work piece is 1ong, auxiliary sup,- porting members are necessary on either side. of the throat to support that part of the work piece fregularitiesron the surface of the workpieceengag'e the regulating wheel. This reduce the depth of ,cut taken at the instant by'thegrinding' wheel'. Where no auxiliary supports areused as describedtabove' the .blade'forrns the sole support for'thetwork piece.

In the operation of the conventional eenterless grinder with-auxiliary work; supports the supports are setlat a height such that the work engages the blade offthe work rest; Usually those supports nearest the grinding'throat are positioned so as. towurge the work pieceat that point toward" the regulating wheel. Therefore when I the work piece is moved up against the grinding wheel to take a heavy out; the grinding wheel ronot in the throat. 1 By canting the' regulating mung; in a direction that forcesfthe work piece ;downwardly .tendstornoveithe Work piece in a direction toward the regulating wheel :but also slightlydownwardlm This throws a considerable force upon the bladeofthe work rest which destroys the blade; causes chattering and marks the work. 'For' these and other-reasons there are very l definite limitations on the amount of cut that can be taken on a given work piece wherea blade is used as a work rest. I I u The present invention makes possible a relatively heavyeut on the work piece by the use of a long roller. as a work rest which roller has line contact with the: work'. piece throughout the grinding throat. With the roller-an extremely heavy cut cazi'be taken on the work piece without the limitations resulting. from the use of 'a blade.

It 7 has been discovered fthat; the [center or the Work piece'can' be positioned'above orbeww the Figure liisafragmentar hodiment of the work rest, v-

]ihe; or cnters of the grinding and: regulating wheelsdepending upon the radius of the work piecev and'the'extentof cut to be taken; The use of the roller of the present invention does away with the highly critical positioning of'the auxiliary supports adjacent the grinding throat. Its

great: length positioned right "at th grinding wheel presents a support alonga line extending V through the grinding; throat thus preventing marking of the'work piece at the pointof greatest pressure, With the roller the ii'r 'c ntk piecec an he positioned sofas to engage'the rollera d the auxiliary supporting elements moved intoposi I t ons t ve t; p in .l n re n "grindin'gfa long 'bar,'f,"forgexarnple, requires much less adjustment and attention generallyf I An important object. of the present invention is the provisionof al centerless grinding machine for taking large cuts on .c'ylindrical workpieces.

j A further important object or; the present invention is the provision of a" centerless grinder for long rods permitting'through-feedof therqd through the grinder while taking a larglef cutl A still; further object of the present invention is the provision of "a workrest for a centerless grinderincorporating an elongated roller mount-, ed onjantifriction bearings.

A still further, important object of th e prese nt invjentionistth provision of a work rest for ",9,

centerlesfs jgrinder incorporating an "elongated roller mountedonantifriction bearings'and hav 1 ing auxiliarywork js'upportmeans on both'sides ofthe din hr at-1.

Other objects andladva tagqsfifof the present invention will be readily apparent from a conside ation of the followingspecification and ap-v. lpended drawings in which Figur elis a view partiall" in elevation and partially in section through the bed of a centerless'grinder looking toward the grinding wheelijf "Figuren2fis aviewin elevation of the'work rest.

shown: in Figure 1:, r

Figure *3 is view infend has en of the wor vati'on' and "partially; in cross-section 'taken throughtthe wor piece 'afndwork support in Fi 4 Figure 51s a view in elevation'otanother-em:-

Figure 6 is a view in, end elevation rest ,shoWninFigureB, and d v Figure 7 i's a fragmentary viewpartiallyin ele, vation' and" partially in cross-section similar to Figure 4 but'showin'gthework rest: of'Figurefi.

of the workcontrol the amount of braking. V

devices H, which engage and support the major face or top. The direction of slope on the top of the t me issuch that downward pressure on the blade due'to'the action of the grinding wheel is resolved into a substantial horizontal compoportion of the work piece IS, the antifriction vices on members l5 being on'pnnpide -qi work piece and those on member IG being on the other side of the work piece to m pmttne-saiae between them. The height 0! theantifriction devices and the distance between those on members l5 and members l6 arejadiustable. Support 1 nent urging the bar away from the grinding wheel and toward the regulating wheel. Thus "an attempt to take a heavy cut is nullified unless the'blade gives transversely. When this happens 'a'violent chattering results which marks ed on bed I0 so as to extend through the grinding throat of the machine is a work rest support W arr -a -r s 8': Th w rk s port and the work rest "are located, respectively, below and in the grinding throat-formed between grinding wheel 2| and regulating n iz-rs'e As bestshown in Figures 3 workrest2fl carries a pair of bearinghousings' 2i enclosing bearing chocks 22. MA nelongated roller]; have spindles 24 carrying roller bearings zi is mounted on {work rest by having the. roller bearings l nomttc d in chocks' 23, Roller bearings are disclosed but any type of bearings may be depending. on the amount of friction heused sired.

Referring i iguresdfto 7 inclusive a work reek- 2} istshown in which thelrnl ler 21, is much more'slender than theroller- 13 of the work rest of Figures Etc 4 inclusive. Whena bar of small diameter is. being ground the roller; mustbe. of

less diameterso' that it will .fitlinthe grinding throat without contactingeither. wheel. As may sometimes be 'preferredfla simplified bearing is disclosed for the rollerof the work rest shown in Figureshltofl inclusive. The-roller merely carries spindlesflwhich fit into endpieces 29 of work rest 28. These end-pieces are recessed at 30 to receive the spindles 28. Elongated slender rollerll when sl hpor'ting a bar having a heavy cut taken thereonrnay have. a tendency to fleiand ta preventsuchiiexure with its resultingstrain on the. roll'erand its bearings, abacking roller 3| is supplied. Backing roller ,3 I fits in a recess 32 in work rest .28.. Inthejembodiment shown the zbackup roller merely turns in this recess although any other suitable rotational mounting may belnsed Under, some conditions a" braking effect maybe necessaiy-onftheroller ct the workrest to prevent the roller 'andtwork piece frmmspinning and hacking rofl 31 mounted asndis closed performs this bra 3 c inz. .iunction. Proper design. of. the bearings offthe roller may also be used to' accomplish 'thislib f k n where desired. t will be understoodathati hacking i011 1| could be omitted tram; thej work rest shown in Figure} or roll '31 could be retained 7 and anti-friction bearings nsedfor the roller to In operation of "either embodiment 'the work rest is. so positioned that thecenter-of the work piece or bar being groun'dais in the neighborhood .0; a line Joining the cen'ters oflthe 1 grinding wheel endure regulatingwwheeljfwhena light out is beingtaken it may be fadvantageous to have=thecenter .of the work piece 'abovethis line and where cu'ts 'are being taken to the work. The roller of the instant invention is positioned substantially in the center of the throat with its axis substantially directly below theaxis of the work piece so no lateral thrust results when a. heavy cut is takem. .It is unnec- .ess'ary to limit the cut Iwith the laterall thrust action because the bearings of' thelrlcllier readily support the increased pressure ofaheavy cut.

Igri dingfa long rodthe machine is set up with auxiliary supportingl inembers l5 'andifi so positioned that .antifriction devices I! hold th e barat the height. of the roller. Devices lTfare so aligned that the rod 'goes. straight through the grinding/throat making-line contact with .the'rcller. The regulating 'wheel'moves thework and a length of 177% inches was passed in large lots through a machine incorporating thepresent inventionand a conventional type machine for'comparison. The machine of the present invention removed all the metal required toprepare the bars for a finish grinder in one pass. The conventional machine. required six. roughing passes to attain the same goali At the same time thema'chine incorporating the present invention made 'm or'e passes than the conventional machine. Here was more than a 500% gain since 7 thejbars passing through the conventional machine had to be each returned for five more passes. Theconventional machine operating on this type of bar will remove 7.006 of an inch from 'thefdiameter on each roughingpass. The machinenf the present invention will, remove .040 of, an inch from the diameter of each roughing pass. Thus a shipment of these bars wasflnished in less than oi the time by the useof the present invention. 'Additionally the reduction in friction resulted in a saving of. about 25% coolant soluble oil over that when a blade was used. T .I

Iclaim: t I

1. A centerless grinder for cylindrical work pieces comprising opposing grindingand regulatln fwh els spaced .to forma grinding throat for the reception of a work piece, a work rest,,.an elongated roller rotatably mounted on .the, work rest and positioned to engage the work piece in the grinding throat, and abacking roller mountedf the'work rest'and positioned to, engage the elongated roller when a heavy cut is being taken on the work piece;

2. A centerless. grinder for cylindrical work pieces comprising opposing grinding and regulating wheels spaced to form a grinding throat for the reception of a work piece, a work rest, an elongated roller rotatably mounted on the Work rest and positioned to engage the Work piece in,

I porting the roller means intermediate the length of the same.

4. A centerless grinder for cylindrical work pieces comprising opposing grinding and regulating wheels spaced to form a grinding throat for the reception of a work piece, a roller extending through the throat for line engagement with the work piece, bearing members located without the throat and portions on the roller rotatably received by the bearing members, the axis of the roller being substantially directly below the axis of the work piece.

5. A centerless grinder for cylindrical work pieces comprising opposing grinding and regulating wheels spaced to form a grinding throat for the reception of a work piece, a roller extending through the throat for line engagement with the work piece, bearing members located without the throat, portions on the roller rotatably received by the bearing members, and friction control means in addition to the friction inherent at the bearing members to impose a controlled braking effect on the roller.

6. A centerless grinder for cylindrical work pieces comprising opposing grinding and regulating wheels spaced to form a grinding throat for the reception of a work piece, a roller extending through the throat for line engagement with the Work piece, bearing members located without the throat, portions on the roller rotatably received by the bearing'members, and friction control means acting on the roller at a point intermediate the bearing members to impose a controlled braking effect on the roller.

7. A centerless grinder for cylindrical work pieces comprising opposing grinding and regulating wheels spaced to form a grinding throat for the reception of a work piece, an elongated rigid roller extending through the throat for line engagement with the work piece, bearing members located without the throat and portions on the roller rotatably received by the bearing members, the axis of the roller being substantially directly below'the axis of the work piece.

8. A centerless grinder for cylindrical Work pieces comprising opposing grinding and regulating wheels spaced to form a grinding throat for the reception of a work piece, the regulating wheel being mounted so as to cause throughfeed of the work piece through the grinding throat, a roller extending through the throat for line engagement with the work piece, bearing members located without the throat, portions on the roller rotatably received by' the bearing members, the axis of the roller being substantially directly below the axis of the work piece and auxiliary supporting means on either side of the grinding throat for supporting a work piece in engagement with the roller.

GEORGE W. RAUSCHENBERGER. 

